EP0032546A1 - Source de lumière à allumage instantané - Google Patents

Source de lumière à allumage instantané Download PDF

Info

Publication number
EP0032546A1
EP0032546A1 EP80107524A EP80107524A EP0032546A1 EP 0032546 A1 EP0032546 A1 EP 0032546A1 EP 80107524 A EP80107524 A EP 80107524A EP 80107524 A EP80107524 A EP 80107524A EP 0032546 A1 EP0032546 A1 EP 0032546A1
Authority
EP
European Patent Office
Prior art keywords
discharge lamp
filament
current
light source
instant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP80107524A
Other languages
German (de)
English (en)
Inventor
Robert J. Regan
Paul O. Haugsjaa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Verizon Laboratories Inc
Original Assignee
GTE Laboratories Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GTE Laboratories Inc filed Critical GTE Laboratories Inc
Publication of EP0032546A1 publication Critical patent/EP0032546A1/fr
Ceased legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/46—Circuits providing for substitution in case of failure of the lamp
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B35/00—Electric light sources using a combination of different types of light generation
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/382—Controlling the intensity of light during the transitional start-up phase
    • H05B41/384—Controlling the intensity of light during the transitional start-up phase in case of hot-restriking
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Definitions

  • This invention relates to instant-on light sources and, more particularly, to light sources wherein a discharge lamp is combined with incandescent filaments and a solid state ballast to provide instant-on lighting.
  • High pressure metal vapor discharge lamps provide significantly higher efficiencies than incandescent lamps and are widely used for general lighting purposes. Such lamps can be operated from standard 60 Hz ac power but require ballast circuits for power factor correction and voltage step-up to develop the requisite high starting potential.
  • Typical ballast circuits include a capacitor and an inductor and are large and heavy.
  • conventional ballast circuits provide poor power regulation for line-voltage variations, are expensive, cause flicker at 60 Hz, and often introduce an audible humming noise into the environment.
  • An inherent disadvantage of metal vapor discharge lamps is the warm-up period of several minutes during which only a low level of illumination is available.
  • the warm-up period or cold-start delay is due to the necessity for the metallic fill material to be vaporized and the lamp envelope to be warmed up before full light output is attained.
  • the discharge is extinguished and cannot be re-initiated until the lamp cools off and the pressure in the lamp is reduced.
  • the warm-up period described above must be repeated before the lamp again reaches full light output.
  • the hot restart delay is thus longer than the cold-start delay.
  • the delays involved in starting and restarting metal vapor lamps are unacceptable in some applications, for example, in household lighting.
  • Metal vapor arc lamps have been operated at frequencies well above 60 Hz.
  • a metal vapor arc lamp operated at 20 to 50 KHz is disclosed in U. S. Patent No. 4,151,445 issued April 24, 1979 to Davenport et al.
  • a comparator circuit senses when the arc lamp voltage is outside a predetermined range and turns on a standby' incandescent filament when the arc lamp voltage is outside that predetermined range.
  • the disclosed light source provides instant light output, it disadvantageously utilizes relatively heavy and expensive inductive components and it generates radio frequency interference (RFI), especially during lamp start-up, thereby potentially causing electromagnetic interference with other electronic equipment.
  • RFID radio frequency interference
  • Metal vapor discharge lamps can be operated directly from dc power sources.
  • Solid state dc lamp ballasts utilizing switching regulators are described by P. Schiff in "Solid-State Ballasting of Mercury-Arc Lamps" RCA Application Note AN-3616, Nov. 1973.
  • a solid state dc lamp ballast commercially available from Quietlite International Ltd. under Model No. QL-75-4, utilizes a series regulator. The discharge lamp draws current from the series regulator during warm-up through a series resistor which is electronically bypassed after the discharge lamp reaches operating temperature. The problem of cold-start delay and hot restart delay remains when the discharge lamp is operated by dc power.
  • Solid state dc ballasts provide power regulation and eliminate heavy magnetic components, 60 Hz flicker, electromagnetic interference, and audible humming. Furthermore, the metal vapor discharge lamp is relatively efficient. Therefore, it is desirable to..provide a solid state dc ballasted light source which has light output during the cold-start and hot restart periods of the discharge lamp. Such a light source is a suitable replacement for the incandescent lamp.
  • a standby incandescent filament provides illumination during the warm-up period of a dc operated high pressure discharge lamp.
  • the light source includes a high pressure discharge lamp and an incandescent filament.
  • the light source also includes means for regulating current delivered to the discharge lamp.
  • the regulating means includes a first input for receiving electrical power from a dc power source, a second input for receiving electrical power from the dc power source through the incandescent filament, and an output coupled to the discharge lamp. The second input draws sufficient current to energize the incandescent filament only during discharge lamp warm-up.
  • the above-described light source further includes a second incandescent filament which provides illumination during the hot restart period of the dc operated high pressure discharge lamp and filament control means coupled in series with the second filament.
  • the filament control means is operative to permit current flow through the second filament when the filament control means senses an absence of discharge in the discharge lamp at a time when the discharge lamp is above a predetermined maximum starting temperature.
  • the filament control means can include thermally responsive switching means, coupled in series with the second filament, and current responsive switching means. The thermally responsive switching means permits current flow through the second filament when the discharge lamp is above a predetermined temperature.
  • the current responsive switching means includes means associated with the discharge lamp for sensing a current therethrough and means coupled in series with the second filament for permitting current flow through the second filament when the current sensing means senses that less than a predetermined current is passing through the discharge lamp.
  • the light source can include a light transmitting envelope enclosing the discharge lamp, the incandescent filaments and the thermally responsive switching means.
  • the light source can also include power conversion means for converting ac power to dc power for operation of the discharge lamp and the incandescent filaments.
  • FIG. 1 One arrangement, according to the prior art, for supplying dc power to a discharge lamp is shown in FIG. 1.
  • the input voltage, 60 Hz, 120 volts, is rectified, doubled and filtered by an ac to dc converter 10.
  • a + output of the converter 10 is coupled to a first input IN 1 of a current regulator 12 and is coupled through a resistor 14 to a second input IN 2 of the current regulator 12.
  • the output of the current regulator 12 is coupled to one terminal of a discharge lamp 16.
  • the other terminal of the discharge lamp 16 is coupled to a - output of the converter 10.
  • a high voltage of approximately 200 volts, which is required to initiate discharge in the lamp 16, is produced by the converter 10.
  • the dc output of the converter 10 drops to a lower level.
  • the current regulator 12 supplies the required voltage and current levels to the discharge lamp 16 during warm-up and normal operation.
  • High pressure discharge lamps characteristically have a low voltage immediately after discharge initiation.
  • the lamp voltage then gradually increases over a period of several minutes as the lamp warms up and the discharge increases in intensity. During this period of reduced lamp voltage, it is necessary to limit the current flow through the lamp.
  • the design of the current regulator 12 is such that, when power is first applied to the apparatus, substantially all the lamp current is drawn through the second input IN and minimal current is drawn through the first input IN 1 .
  • the resistor 14 is effectively in series with the lamp 16 and the lamp current is limited.
  • the current drawn through the input IN gradually increases and the current drawn through the input IN 2 and the resistor 14 gradually decreases.
  • the discharge lamp 16 reaches normal operating temperature, substantially all the lamp current is drawn through the first input IN and the resistor 14 is effectively bypassed.
  • the apparatus shown in FIG. 1 produces a low level of illumination for several minutes during the warm-up period of the discharge lamp 16. Furthermore, when the power is momentarily interrupted, the discharge cannot be re-initiated and no illumination is produced until the discharge lamp 16 cools down to its maximum restart temperature. After the discharge is re-initiated, the warm-up period is repeated.
  • a preferred embodiment of the present invention is shown in block diagram form in FIG. 2 and in schematic form in FIG. 3.
  • a high pressure discharge lamp is supplemented by incandescent filaments during the warm-up and hot restart periods of the discharge lamp to provide an instant-on light source.
  • instant-on refers to what is perceived by a human observer when the light source is turned on.
  • an ac to dc converter 20 has a + output which is coupled to a first input IN of a current regulator 22 and which is coupled through an incandescent filament 24 to a second input IN 2 of the current regulator 22.
  • the output of the current regulator 22 is coupled to one terminal of a discharge lamp 26.
  • the other terminal of the discharge lamp 26 is coupled through a current sensor 28 to a - output of the converter 20.
  • the series combination of an incandescent filament 30, a thermally responsive switch illustrated as a bimetal switch 32, and an electronic switch 34 is coupled between the + and - output of the converter 20.
  • a control input of the electronic switch 34 is coupled to the current sensor 28.
  • the bimetal switch closes when the discharge lamp 26 is above a predetermined maximum starting temperature which can be defined as the maximum temperature at which the applied voltage automatically re-initiates discharge.
  • a predetermined maximum starting temperature which can be defined as the maximum temperature at which the applied voltage automatically re-initiates discharge.
  • the combination of the bimetal switch 32, the electronic switch 34 and the current sensor 28 form a filament control 36 which permits current flow through the filament 30 when the filament control 36 senses the absence of discharge in the discharge lamp 26 at a time when the discharge lamp is above its maximum starting temperature.
  • the ac to dc converter 20 includes a full wave rectifier which is formed by four diodes Dl-D4 in a conventional manner.
  • the intersection of the cathodes of the diodes D2 and D4 forms the + output of the converter 20, while the intersection of the anodes of the diodes Dl and D3 forms the - output of the converter 20.
  • Capacitors Cl and C2 are coupled in parallel with the diodes D3 and D4, respectively, to form a voltage doubler.
  • a filter capacitor C3 is coupled between the + output and the - output of the converter 20.
  • the current regulator 22 includes resistors Rl-R5, transistors Ql-Q3, diode D5, and capacitor C4.
  • the + output of converter 20 is coupled through the thermal resistor R3 to the collector of the npn transistor Ql, which is a high voltage breakdown, low saturation voltage device.
  • the point of connection between the + output of the converter 20 and the thermal resistor R3 forms the first input IN of the current regulator 22.
  • the + output of converter 20 is also coupled through an incandescent filament 24 to the anode of the diode D5 and to the emitter of the pnp transistor Q2 which can be a 2N6489.
  • the point of connection between the filament 24, the anode of the diode D5, and the emitter of the transistor Q2 forms the second input IN 2 of the current regulator 22.
  • the cathode of the diode D5 is coupled to the base of the transistor Ql.
  • the + output of converter 20 is further coupled through the resistor Rl to the base of the npn transistor Q3 which can be a 2N4400.
  • the base of transistor Q3 is coupled to the - output of the converter 20 through the resistor R2 so that the resistors Rl and R2 form a voltage divider across the outputs of the converter 20.
  • the base of the transistor Q3 is also coupled through a parallel connection of the resistor R4 and the capacitor C4 to the emitter of the transistor Ql.
  • the collector of the transistor Q3 is coupled to the base of the transistor Q2.
  • the emitter of the transistor Ql is coupled through the resistor R5 to one terminal of a discharge lamp 26.
  • the collector of the transistor Q2 and the emitter of the transistor Q3 are also coupled to the one terminal of the discharge lamp 26.
  • the point of connection between the collector of the transistor Q2, the emitter of the transistor Q3, the resistor R5, and the discharge lamp 26 forms the output of the current regulator 22.
  • the other terminal of the discharge lamp 26 is coupled through a current sensing resistor 28 to the - output of the converter 20.
  • One suitable filament 24 has a cold resistance of 14 ohms and produces illumination at 120 volts with a resistance at 120 volts of 200 ohms.
  • Suitable values of Rl-R5 for operation of a 75 watt discharge lamp are as follows:
  • An incandescent filament 30, a thermally responsive switch illustrated as a bimetal switch 32, and an electronic switch 34 are coupled in series between the + output and the - output of the converter 20. While the resistance of the filament 30 can be any convenient value, it should provide adequate illumination during restart. One suitable filament has a cold resistance of 21 ohms and produces illumination of 120 volts with a resistance at 120 volts of 300 ohms.
  • the electronic switch 34 as shown in FIG. 3, includes transistors Q4 and Q5 and resistors R6-R8. The junction point of current sensing resistor 28 and the discharge lamp 26 is coupled through the current limiting resistor R8 to the base of the npn transistor Q5.
  • the collector of the transistor Q5 is coupled through the current limiting resistor R6 to the base of the npn transistor Q4 and through the biasing resistor R7 to a voltage source such as the + output of the converter 20.
  • the collector of the transistor Q4 is coupled to the bimetal switch 32.
  • the emitters of the transistors Q4 and Q5 are coupled to the - output of the converter 20.
  • the bimetal switch 32 is in sufficiently close proximity to the discharge lamp 26 to sense its temperature and is in a closed position when the discharge lamp 26 is above a predetermined temperature.
  • the current regulator 22 includes two main current paths for the discharge lamp 26 current, one through the transistor Ql which conducts during normal operation of the discharge lamp 26 and the other through the transistor Q2 which conducts during the warm-up period of the discharge lamp 26.
  • normal operation refers to operation of the discharge lamp 26 after it has reached steady-state operating temperature and excludes the transient operation during the warm-up and hot restart periods of the discharge lamp 26.
  • the input voltage typically 60 Hz, 120 volts
  • the input voltage is rectified and doubled by the diodes Dl-D4 and the capacitors Cl and C2 and filtered by the capacitor C3 to produce, between the + and - outputs of the converter 20, a dc voltage with some 120 Hz ripple.
  • voltage doublers or other voltage multipliers are utilized in the converter 20 only when required to operate the discharge lamp 26.
  • the converter 20 produces in excess of 200 volts at its output as required for initiation of a discharge in a 75 watt lamp 26. After discharge initiation and during normal operation, the voltage across the capacitor C3 drops to approximately 120 volts because of the loading effect of the discharge lamp 26.
  • the transistor Q2 is biased on and the low saturation voltage of the transistor Q2, appearing across the series combination of the diode D5, the base to emitter junction of transistor Ql and resistor R5, biases transistor Ql off.
  • the bimetal switch 32 is in the open position and the incandescent filament 30 is de-energized.
  • the discharge lamp 26 gradually warms up and approaches its normal operating temperature, the intensity of the discharge therein and the voltage there- across increase.
  • the discharge lamp 26 voltage, appearing at the emitter of transistor Q3, is greater than the base voltage of transistor Q3, causing the transistors Q3 and Q2 to be biased off.
  • transistor Q2 is biased off, the transistor Ql is biased on by current supplied through the filament 24 and the diode D5 to the base of transistor Ql.
  • the thermal resistor R3 is decreasing in resistance and the current through the transistor Ql increases.
  • the net effect during the warm-up period is a gradual transfer of discharge lamp 26 current from the transistor Q2 to the transistor Ql and a gradual de-energization of the filament 24.
  • the filament 24 supplies only transistor Ql base current which is insufficient to produce illumination from the filament 24. The filament 24 therefore provides illumination immediately upon application of power and during the warm-up of the discharge lamp 26.
  • the transistor Q2 is biased off, the transistor Ql is biased on and provides current to the discharge lamp 26, and the filament 24 provides no illumination as described hereinabove.
  • the temperature of the discharge lamp 26 is above the predetermined maximum switching temperature of the bimetal switch 32 which therefore is closed and couples the filament 30 to the electronic switch 34.
  • the lamp current passing through the current sensing resistor 28 produces a voltage which biases the transistor Q5 on.
  • the low voltage at the collector of the saturated transistor Q5 biases the transistor Q4 off and the electronic switch 34 is in the open or nonconducting state.
  • the filament 30 is de-energized during normal operation of the discharge lamp 26.
  • the operation of the light source of FIG. 3 during hot restart is described as follows.
  • the discharge in the lamp 26 is extinguished and no current flows through the discharge lamp 26 and the resistor 28.
  • the voltage across resistor 28 is zero and the transistor Q5 is biased off which, in turn, permits base current to be supplied to the transistor Q5 through resistors R6 and R7 and the transistor Q4 is biased on.
  • the electronic switch 34 is in the closed or conducting state. Since the power interruption was momentary, the discharge lamp 26 is still hot and the bimetal switch 32 maintains the connection between the filament 30 and the electronic switch 34.
  • the applied voltage now in excess of 200 volts, is unable to start the discharge lamp 26 in its hot condition.
  • the filament 30 provides illumination immediately after power interruption and during the cooling down period of the discharge lamp 26 prior to restart.
  • the discharge lamp 26 gradually cools to its predetermined maximum starting temperature and the applied voltage automatically re-initiates discharge.
  • the predetermined temperature at which the bimetal switch 32 operates is slightly below the restart temperature of the discharge lamp 26.
  • the filament 30 provides illumination until the discharge in the lamp 26 is re-initiated and current flow through the discharge lamp 26 and the resistor 28 is re-established.
  • the re-established current flow through the resistor 28 causes the electronic switch 34 to open and the filament 30 to be de-energized.
  • the discharge lamp 26 is well below normal operating temperature and provides a low level of illumination.
  • the warm-up sequence described hereinabove is repeated and the filament 24 provides illumination until the discharge lamp 26 reaches normal operating temperature.
  • the present invention can be utilized with high pressure discharge lamps which can operate at a relatively constant current and an increasing voltage during the warm-up period.
  • a lamp with a voltage drop very near the dc supply voltage is preferred since less power must be dissipated in the filament or current regulator during normal, fully warmed-up operation.
  • Such discharge lamps are well known in the art and are commercially available. Examples of such lamps are high pressure sodium lamps, high pressure mercury vapor lamps, -and metal halide lamps.
  • high pressure discharge lamps include a quartz or alumina cylindrical discharge tube enclosed by a glass outer envelope. The fill material is enclosed within the cylindrical discharge tube.
  • a phosphor coating on the outer envelope converts ultraviolet radiation produced by the discharge to visible light.
  • One suitable mercury vapor lamp is GTE Sylvania, 75 watt, model H43AY-75DX.
  • Other lamps, particularly lower power lamps which are more suitable for replacement of incandescent lamps can be built by one skilled in the art and used in the present invention.
  • the discharge lamp 26, the incandescent filaments 24 and 30, and the bimetal switch 32 can be enclosed by a single envelope 40 as illustrated in FIG. 2.
  • the inner surface of the envelope 40 can be coated with a phosphor, for example, when the discharge lamp 26 is a mercury vapor lamp.
  • the filaments 24 and 30 can be enclosed by a light transmitting envelope (not shown) which is placed with the discharge lamp 26 and the bimetal switch 32 within the envelope 40.
  • This configuration has the advantage of preventing any material emitted by the discharge lamp 26 from contaminating the filaments 24 and 30.
  • the discharge lamp 26 and the bimetal switch 32 are enclosed by the envelope 40 and the filaments 24 and 30 are enclosed by a separate envelope (not shown) which is external to the envelope 40.
  • any suitable ac to dc converter well known to those skilled in the art and capable of providing the requisite starting and operating voltages, can be utilized.
  • the light source can be operated from various input frequencies and voltage levels by a suitable choice of an ac to dc converter.
  • the light source can be operated from a battery or other dc source.
  • the filament control 36 can include various sensors and switching circuits which are operative to permit current flow through the filament 30..when the discharge lamp 26 is above a predetermined temperature but has no discharge therein.
  • the current sensor 28 can be replaced by a photosensor which senses the light output of the discharge lamp 26.
  • the electronic switch 34 various well known switching circuits can be used to control the current through the filament 30.
  • the bimetal switch 32 can be replaced, for example, by a switching circuit controlled by a thermocouple.
  • the bimetal switch can also include a set of contacts which are closed when the discharge lamp 26 is below the predetermined switching temperature. The added contacts are used to connect the filaments 24 and 30 in parallel, thus providing additional illumination during the warm-up period. Above the predetermined switching temperature, the filament 30 is coupled by the bimetal switch to the electronic switch 34 as above-described.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
EP80107524A 1979-12-03 1980-12-02 Source de lumière à allumage instantané Ceased EP0032546A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/099,770 US4278916A (en) 1979-12-03 1979-12-03 Instant-on light source
US99770 1979-12-03

Publications (1)

Publication Number Publication Date
EP0032546A1 true EP0032546A1 (fr) 1981-07-29

Family

ID=22276535

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80107524A Ceased EP0032546A1 (fr) 1979-12-03 1980-12-02 Source de lumière à allumage instantané

Country Status (4)

Country Link
US (1) US4278916A (fr)
EP (1) EP0032546A1 (fr)
JP (1) JPS5691393A (fr)
CA (1) CA1154075A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0091728A1 (fr) * 1982-02-26 1983-10-19 GTE Laboratories Incorporated Source pour lampe à arc
FR2551613A1 (fr) * 1983-07-28 1985-03-08 Tungsram Reszvenytarsasag Dispositif d'eclairage forme d'un redresseur, une lampe et un element limiteur de courant
GB2215535A (en) * 1988-03-11 1989-09-20 Philips Electronic Associated Discharge lamp lighting system
EP2575414A3 (fr) * 2011-09-29 2014-07-16 General Electric Company Détecteur de lumière pour commander une lampe hybride

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4340843A (en) * 1979-04-12 1982-07-20 General Electric Company Keep-alive circuit for gas discharge lamp
NL188821C (nl) * 1979-11-28 1992-10-01 Mitsubishi Electric Corp Gasontladingslamp.
HU183313B (en) * 1981-02-06 1984-04-28 Egyesuelt Izzolampa Lighting system and electric lighting unit of compact structure
US4382210A (en) * 1981-12-18 1983-05-03 Gte Laboratories Incorporated Ballast circuit for direct current arc lamp
HU190862B (en) * 1983-11-23 1986-11-28 Tungsram Rt,Hu High-pressure discharge lamp with favourable colour reproduction
EP0168874B1 (fr) * 1984-07-03 1988-09-21 Koninklijke Philips Electronics N.V. Lampe électrique à incandescence
US5066892A (en) * 1990-12-07 1991-11-19 Gte Products Corporation Glow discharge lamp with incandescent filament
US7912562B2 (en) * 2000-07-25 2011-03-22 Electronic Solutions, Inc. System, device and method for comprehensive input/output interface between process or machine transducers and controlling device or system
US6674249B1 (en) * 2000-10-25 2004-01-06 Advanced Lighting Technologies, Inc. Resistively ballasted gaseous discharge lamp circuit and method
US8228002B2 (en) * 2008-09-05 2012-07-24 Lutron Electronics Co., Inc. Hybrid light source
US8008866B2 (en) 2008-09-05 2011-08-30 Lutron Electronics Co., Inc. Hybrid light source
US8970110B2 (en) 2012-10-17 2015-03-03 Elwha Llc Managed multiple-filament incandescent lighting system
US8723421B2 (en) * 2012-10-17 2014-05-13 Elwha Llc Multiple-filament incandescent lighting system managed in response to a sensor detected aspect of a filament
US9049758B2 (en) 2012-10-17 2015-06-02 Elwha Llc Multiple-filament tungsten-halogen lighting system having managed tungsten redeposition

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7901462A (nl) * 1978-03-10 1979-09-12 Gen Electric Combinatie van ontladingslamp en gloeilamp met een thermische regelschakelaar.

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3517254A (en) * 1968-05-14 1970-06-23 Esquire Inc Continuous lighting system for gaseous-discharge lamps with incandescent lights for standby
US3536954A (en) * 1968-07-11 1970-10-27 Holophane Co Inc Instant illumination and ballast circuit for gas discharge lamp
US3693045A (en) * 1970-02-13 1972-09-19 Guth Co Edwin F Illumination
US3737720A (en) * 1971-08-02 1973-06-05 Gen Electric Lighting system with auxiliary lamp control circuit
US3737719A (en) * 1971-08-02 1973-06-05 Gen Electric Lighting system with auxiliary lamp control circuit and protective means therefor
US4005331A (en) * 1973-06-19 1977-01-25 Current Industries, Inc. High intensity discharge lamp with auxiliary light
US4151445A (en) * 1978-02-15 1979-04-24 General Electric Company Instant light lamp control circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7901462A (nl) * 1978-03-10 1979-09-12 Gen Electric Combinatie van ontladingslamp en gloeilamp met een thermische regelschakelaar.

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0091728A1 (fr) * 1982-02-26 1983-10-19 GTE Laboratories Incorporated Source pour lampe à arc
FR2551613A1 (fr) * 1983-07-28 1985-03-08 Tungsram Reszvenytarsasag Dispositif d'eclairage forme d'un redresseur, une lampe et un element limiteur de courant
GB2215535A (en) * 1988-03-11 1989-09-20 Philips Electronic Associated Discharge lamp lighting system
EP2575414A3 (fr) * 2011-09-29 2014-07-16 General Electric Company Détecteur de lumière pour commander une lampe hybride

Also Published As

Publication number Publication date
CA1154075A (fr) 1983-09-20
US4278916A (en) 1981-07-14
JPS5691393A (en) 1981-07-24

Similar Documents

Publication Publication Date Title
US4278916A (en) Instant-on light source
CA1155169A (fr) Lampe a arc avec filament incandescent en serie a titre de ballast
US4132925A (en) Direct current ballasting and starting circuitry for gaseous discharge lamps
US4523131A (en) Dimmable electronic gas discharge lamp ballast
US4277726A (en) Solid-state ballast for rapid-start type fluorescent lamps
US5030887A (en) High frequency fluorescent lamp exciter
US4949016A (en) Circuit for supplying constant power to a gas discharge lamp
US7075251B2 (en) Universal platform for phase dimming discharge lighting ballast and lamp
US4358717A (en) Direct current power source for an electric discharge lamp
US5581161A (en) DC coupled electronic ballast with a larger DC and smaller AC signal
US4777409A (en) Fluorescent lamp energizing circuit
US5925985A (en) Electronic ballast circuit for igniting, supplying and dimming a gas discharge lamp
GB2052190A (en) Direct Current Power Supply for an Electric Discharge Lamp
US4437042A (en) Starting and operating circuit for gaseous discharge lamps
ES8101832A1 (es) Unidad de iluminacion
US4331905A (en) Starting and operating circuit for gaseous discharge lamps
US4399392A (en) Arc lamp power supply
US4382210A (en) Ballast circuit for direct current arc lamp
US3890540A (en) Apparatus for operating gaseous discharge lamps on direct current from a source of alternating current
JPS58147997A (ja) 放電灯作動装置
JPH10112396A (ja) 放電灯点灯装置
KR100634481B1 (ko) 형광등의 구동방법 및 이를 수행하기 위한 안정기 회로
US4409522A (en) Direct current power source for an electric discharge lamp using reduced starting current
CA1109516A (fr) Circuits de regulation et d'amorcage a courant continu pour lampes a decharge
JP2989755B2 (ja) 点灯装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19801203

AK Designated contracting states

Designated state(s): BE DE FR GB IT NL

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 19851126

RIN1 Information on inventor provided before grant (corrected)

Inventor name: REGAN, ROBERT J.

Inventor name: HAUGSJAA, PAUL O.